SU353531A1 - The method of wastewater treatment from fine suspended particles with a high content of silicon dioxide - Google Patents

Description

(54) METHOD FOR CLEANING WASTE WATER FROM THIN-DISPERSED FOLDED SUBSTANCES. WITH HIGH CONTENT OF DIOXIDE

The invention relates to the field of wastewater treatment of chemical industry enterprises.

A known method of purification of waste water from fine suspended solids

by treating them with iron-containing docoagulum and calcium or magnesium compounds at a pH of 7.1-8.8 and a ratio of 2 + SL4 of the ION Sails Mg to suspension

1: 1.

The disadvantages of this method are the low degree of purification and the significant consumption of reagents.

The proposed method differs from the known one in that the purification process is carried out with a weight ratio of calcium or magnesium ions to a fine silica slurry equal to 1: (10-60). This makes it possible to increase the degree of purification by 1520% and reduce the consumption of iron-containing coagulum by 3 times.

Silicon

average particle size less than 1 micron), is carbonized to make sMciHCOj. Then, with suspension, 10 ml of a solution containing 28 g / l of Co ce2 and 20.5 g / l of Fe (weight ratio Ca: suspension 1: 30) are mixed into the suspension; pH of 7.8. The formed flakes together with suspended solids are quickly settled. After 2 hours, the apparent volume of sediment was 9.3%, and in a day, 6.5%. The content of suspended solids in the liquid phase does not exceed 300 mg / l.

Claims (2)

Example 2. Sewage containing 2.2 g / l of particulate matter (white soot), 2 g / l of NdigCO-j and 0.43 g / l of Na2SO-15 ml of wastewater of chemically precipitated chalk (Ca: suspension 1 : 5O). The mixture is carbonized to become NaHCO 3 and 5 ml of a solution containing 15.6 g / l 6 (504) 3 is added with stirring. Temperature 35 ° С: pH 8.3. After 2 hours of settling, the apparent sediment volume is 5%, and in a day, 1.5%. 1 phase is transparent (suspended matter content less than 30 mg / l). Example 3.1l of wastewater containing 2.5 g / l of suspended solids (white soot), 2.3 g / l of NOjCOg and O, 3 g / l of N0 (2.50 is neutralized with 5% NdBO for phenolphthalein, is introduced with stirring 10 ml of a solution containing 55 g / MgCP (Mg. Suspension 1:15) and then Yu ml of a solution containing 15.6 g / l of Ge (,,. Temperature 26 ° C; pH 7, 2. After 2 hours of settling, the apparent volume of sediment is 8%, and in a day 3.5%. The liquid phase is transparent (the content of the material is less than 30 mg / l). Example 4. K1l of wastewater containing 2.4 g / l of particulate matter (white carbon), 3.15 g / l of NaHCO O, 22 g / l of NdjCO-i, and 0.4 g / l of 10 ml of a solution containing 28 g / lCaCP (weight ratio Ca: suspension 1:23), and with stirring, 8 ml of a solution containing 18.2 g / l geozd. Temperature 19 ° С; pH 8.5. After 2 hours of settling, the apparent sediment volume is 10%, and in a day, 7.5%. The liquid phase is transparent (the content of substances is less than 30 mg / l). Thus, the technical and economic advantages of the proposed method consist in achieving a sufficiently high degree of purification of wastewater containing finely dispersed silicon dioxide, with low reagent consumption. The invention of the method of wastewater treatment from fine suspended suspended. substances with a high content of silicon dioxide by treating them with iron-containing coagulant and water-soluble compounds of kalysh or magnesium at a pH of 7.1-8.8, which is characterized by the fact that, in order to increase the degree of purification and reduce the consumption of reagents, the weight ratio of calcium or magnesium ions to a finely dispersed suspension of dioxide, equal to 1: (10-60).